Multicylinder combustion motor



May 20, 1930.

J. BRONS 1,759,776

MULTICYLINDER COMBUSTION MOTOR Filed Jan. '7, 1927 JAN BRO/VS ATTOZNE YJ Patented May 20, 1930 UNITED STATES PATENT OFFICE JAN BRONS, 0F APPINGEDAM, NETHERLANDS, ASSIGNQR T0 NAAMILOOZIE VENNOOT- SCHAP APPINGEDAMMER BRONSMOTORENFABRIEK, OF APPINGEDAM, NEITHER- LANDS MULTICYLINDER COMBUSTION MOTOR Application filed January 7; 1927, Serial No. 159,708, and in the Netherlands January 15, 1926.

This invention relates to the distribution of liquid fuel over the cylinders of internal combustion motors.

The correct distribution of the required fuel in combustion motors is of great imporing-nozzle has the same quantity of fuel sup ply it is desirable to use one single fuelpump for all cylinders and to let the pump.

make as many strokes as injections are required. The pump then can act on one main conduit with branch-pipes to the different spraying-nozzles, so that each delivery-stroke of the pump causes the pressure to yary up to a few hundred atmospheres pressure on the fuel behind the pistons of the needle-Valves.

In this way all the nozzles are connected at the same time to the fuel-supply under the saine pressure, independent of the cylinder which is to be provided with fuel, so that always the same quantity of fuel leaks away.- If the piston does-not fit tightly in its cylinder, the leakage will result in an escaping of the fuel along the piston in an upward direction, but since all the nozzles are connected to the fuel supply under the same pressure, the delivery strokes of the pump will efi'ect the same pressure on the fuel below the piston of the needle-valve and hence the same quantity of fuelwill be supplied to each of the cylinders. In this way no difference arises in the quantity of injected fuel.

According as to whether the motor is more or less charged the quantity of the fuel to be injected is regulated bym aking the pumpstroke longer or shorter or with the aid of pressure of the needle-valves being lowered successively at the moment of injection of the fuel so that the pressure of the fuel is' able to open the valve for the cylinder in question. The spraying thus only takes place in that cylinder for whichthe spring-pressure on the needle-valve is lowered temporarily.

So with such a device each cylinder always has, independent of the differences in leakages of the needle-valves, the same quantity of fuel supplied since all the leakages are replenished by the mutual main conduit.

The temporary decrease of the spring-pressure of the needle-valves can be obtained in different manners, for instance by using a counter-spring.

According to the present invention the desired result is attained by means of a shaft carrying a plurality of cams which actuate .a lever associated with the needle Valves.

The rotating of each cam effects a partial neutralizing of the spring pressure of the needle valveat' a predetermined time. One form of my invention is shown in the accompanying drawing.

On thecam-shaft 1 a number of cams 2 are mounted'correspondingwith the number of needle-valves against which the rollers 3 of the levers l rest. On the spring 6 of the valve-box 7 an adjusting-screw 5 connected to the lever 4 rests. vIn the position shown, no extra pressure on the spring-is effectedby the screw 5,- so that'in that moment the needle-valve can open under the influence of the pressure of the supplied fuel and thus the fuel can be injected into the cylinders 11.

The spring-stress then namely islower than the influence of the pressure of the fuel in the main-conduit8 on the piston 9 which leads from the power pump 12, so that the latter is moved against the action of the spring and the needle-valve 10 is opened so that the required injection will take place.

During this time the springs of the other needle-valves are stressed stronger as the 'corresponding rollers 30f the levers 4 are pressed up by the larger diameter of the cylindrical part of the cams 2, causing the screws 5 to exercise more stress upon the springs 6. The

' tension stress of the springs will close the o it is clear that with the alternative decrease of the spring-stress of the needle-valves it is attained that the supplied fuel can be injected past only one of the needle-valves at a time.

' It will be obvious that when the parts are in the position as shown that the cam controlling the left-hand cylinder is turned towards its coacting roller with its flattened part. Hence no extra pressure is exerted by the lever on the sprin of the left-hand piston and said piston wi 1 be pressed upwardly by the fuel, and in consequence the needle valve will open and fuel is injected into the left-hand cylinder. At the same time the cam 5 for the right-hand piston is turned from the roller thereof with its rounded part. Consequently the pressure of the right-hand spring 6 is increased by the associated lever and the resiective needle valves tightly on their seats.

pressure upon the fuel will not be suflicient to move the right hand piston in an upward direction to open the needle valve. Hence no fuel will be injected into the right-hand cylinder. I a 1 I claim:

name to this specification.

A fuel-injecting device for multi-cylinder combustion engines having a needle valve for each cylinder adapted to inject fuel into said cylinder, a spring associated with each needle valve, a source of fuel supply connected to each valve and having a pressure substantially equal to the normal'spring pressure of the,

needle valve, a cam shaft and rocker arm mechanism associated Wi h said springs and adapted to increase and decrease the pressure of said springs at predetermined time inter vals whereby the needle valves are held in closed position by said spring pressure, and released at a predetermined time by the pres- (slure of the fuel to inject fuel into the cyliners. lksmsterdam, this 27th day of December, In testimony whereof I have signed my JAN BRONS. 

